NTN - Plummer Blocks

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Strength of Plummer Blocks, and Combination with Bearings

4. Strength of Plummer Blocks, and Combination with Bearings

4.1 Strength of plummer blocks

The disruptive strength of plummer block varies

depending on its type, nature and direction of a load

working on it, as well as the flatness of a surface to which

it is installed. The typical trend of static disruptive strength

of SN5 and SN6 (S6) series of cast iron plummer blocks

is plotted in Figs. 4.1 and 4.2 respectively.

When selecting a plummer block, the safety factors in

Table 4.1 must be considered. Also, a higher grade of

flatness is required of a surface for mounting a plummer

block.

Table 4.1 Safety factors of cast iron plummer blocks

Nature of load

Safety factor

Light

4

Repeated

6

Alternating

10

Shock

To counter a horizontal or axial load, the face

of the bed must be secured with a stopper.

For applications where extreme shock load is

present or a fractured plummer block can lead

to severe accident, NTN offers special plummer

blocks made of spherical graphite cast iron or

cast steel. For further information, contact NTN

Engineering.

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Fig. 4.1 Static disruptive strength of SN5 series

Fig 4.2 Static disruptive strength of SN6 (S6) series

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